Reduction gear



FIG. 1 is a top, front, right side perspective view of a reduction gear;

FIG. 2 is a bottom, rear, left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The evenly-spaced broken lines depict portions of the reduction gearthat form no part of the claimed design.

The unevenly-spaced broken lines in FIGS. 1 and 7 represent a boundaryof the claim that forms no part of the claimed design.

CLAIM The ornamental design for a reduction gear, as shown anddescribed.